Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Derivative financial instruments (Notional amounts and fair values of derivatives outstanding) (Details)

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Derivative financial instruments (Notional amounts and fair values of derivatives outstanding) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Total derivative assets    
Derivative assets, fair value $ 11,664 $ 69,105
Total derivative liabilities    
Derivative liabilities, fair value 97,066 29,321
Not Designated as Hedging Instrument | Interest rate caps    
Total derivative assets    
Derivative assets, Notional amount 2,442,000 2,523,500
Derivative assets, fair value 3,727 32,547
Designated as Hedging Instrument | Interest rate caps    
Total derivative assets    
Derivative assets, Notional amount 400,000 0
Derivative assets, fair value 6,359 0
Designated as Hedging Instrument | Interest rate swaps | Cash Flow Hedging    
Total derivative assets    
Derivative assets, Notional amount 488,616 1,900,957
Derivative assets, fair value 1,578 36,558
Total derivative liabilities    
Derivative liabilities, notional amount 3,776,000 1,375,000
Derivative liabilities, fair value $ 97,066 $ 29,321